2-Hydroxy-3-nitrobenzaldehyde can be extracted from the leaves of Actephila merrilliana. Its molecule is planar. On reaction with dapsone, it affords a colorless solution.2-Hydroxy-3-nitrobenzaldehyde may be used in the synthesis of 5-acetyl-4-aryl-6-methyl-1,2,3,4-tetrahydro pyrimidine. 2-Hydroxy-3-nitrobenzaldehyde can be extracted from the leaves of Actephila merrilliana. Its molecule is planar. On reaction with dapsone, it affords a colorless solution. application： 2-Hydroxy-3-nitrobenzaldehyde may be used in the synthesis of 5-acetyl-4-aryl-6-methyl-1,2,3,4-tetrahydro pyrimidine.